2. HBV screening test/initial biospecimen banking: All participants will receive hepatitis B testing. For blood sampling procedure, the investigators will have a part-time phlebotomist working in the field with a bilingual staff and LHW. The phlebotomist will draw two tubes of blood from study participants at the study site. He/she will then transport one tube of the blood in red-top tube to certified clinical labs (i.e., Johns Hopkins Medical Institute (JHMI), Quest, LabCorp) for hepatitis B tests (e.g., HBsAg, HBsAb (surface antibody of HBV), HBcAb (core antibody of HBV)). The other tube will be processed for research sample banking.